Adaptive rate and power DS/CDMA communications in fading channels

Abstract

We investigate the average information rates attained by adapting the transmit power and the information rate relative to channel variations in code division multiple access communication systems, Our results show that the rate adaptation provides a higher average information rate than the power adaptation for a given average transmit power, and the rate increase when using rate adaptation is more significant for channels with a faster decaying multipath intensity profile and weaker line-of-sight component.